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32 .Nd set local timezone
36 .Op Fl C Ar chroot_directory
37 .Op Ar zoneinfo_file | zoneinfo_name
41 utility reads a database of timezone information and presents a menu
42 allowing the user to select a specific zone without knowing the details
43 of the database layout.
44 The selected zone is installed as the system
48 utility also determines whether any adjustment is necessary for systems where
49 the hardware clock does not keep UTC.
51 The following options are available:
52 .Bl -tag -offset indent -width Fl
53 .It Fl C Ar chroot_directory
54 Open all files and directories relative to
55 .Ar chroot_directory .
57 Do not create or copy files.
59 Reinstall the zoneinfo file installed last time.
60 The name is obtained from
61 .Pa /var/db/zoneinfo .
63 Skip the initial question about adjusting the clock if not set to UTC.
66 It is possible to short-circuit the menu system by specifying the
71 on the command line; this is intended mainly for pre-configured installation
72 scripts or people who know which zoneinfo they want to install.
74 The contents of the timezone database are indexed by
75 .Pa /usr/share/zoneinfo/zone1970.tab .
76 This file lists, for each timezone data file, the ISO 3166 territory code,
77 approximate geographical coordinates (in ISO 6709 format),
78 and location within the territory.
80 The maintainers of the database maintain the following policies:
81 .Bl -enum -offset indent
83 At least one zone for every country or inhabited geographical territory.
85 One zone for every distinct, documented timezone history since the
88 epoch (January 1, 1970, GMT).
90 Each zone is named for the most populous city therein.
92 the database includes pre-1970 history for its city.)
95 The source code to the database
96 .Pq Pa /usr/src/contrib/tzdata/[a-z]*
97 contains many additional comments and documentation references for the
100 .Bl -tag -width ".Pa /usr/share/zoneinfo/zone1970.tab" -compact
101 .It Pa /etc/localtime
102 current time zone file
103 .It Pa /etc/wall_cmos_clock
106 .It Pa /usr/share/misc/iso3166
107 mapping of ISO 3166 territory codes to names
108 .It Pa /usr/share/zoneinfo
109 directory for zoneinfo files
110 .It Pa /usr/share/zoneinfo/zone1970.tab
111 mapping of timezone file to country and location
112 .It Pa /var/db/zoneinfo
113 saved name of the timezone file installed last
116 Normal usage, to select the right zoneinfo file via the dialog-based
122 .Pa /usr/share/zoneinfo/Australia/Sydney :
124 .Dl "# tzsetup /usr/share/zoneinfo/Australia/Sydney"
126 Install the zoneinfo file for Australia/Sydney, assumed to be located in
127 .Pa /usr/share/zoneinfo :
129 .Dl "# tzsetup Australia/Sydney"
131 After a reinstall of the zoneinfo files, you can reinstall the
132 latest installed zoneinfo file (as specified in
133 .Pa /var/db/zoneinfo ) :
146 The representation of certain localities as being associated with certain
147 countries and/or territories is for the purposes of identification only,
148 and does not imply any endorsement or rejection on the part of the
150 Project of the territorial claims of any entity.
152 Programs which are already running when
156 will not reflect the updated timezone.
157 When the system is first configured for a non-UTC
158 hardware clock, it is necessary to run
160 (which normally happens as a part of system startup) in order to update
161 the kernel's idea of the correct timezone offset.